<div class="container"></div>

<style>
/* From Uiverse.io by BadlyWrittenStylesheet  - Tags: gradient, dark, colorful, rainbow, multicolor, pattern, background */
.container {
  width: 100%;
  height: 100%;
  /* Add your background pattern here */
  /* background-color: lightblue; */
  background-image: radial-gradient(black 55%, #0000),
    /* radial-gradient(black 55%, #0000), */
      linear-gradient(
        135deg,
        red,
        orange,
        yellow,
        lime,
        cyan,
        blue,
        indigo,
        deeppink
      );
  background-size: 100% 0.5%, contain;
  /* background-blend-mode: hard-light; */
  /* background-position: 0 0, 1em 1em, 0 0; */
}

</style>
    